Printing plate holder



Feb. 27, 1945, s'n 2,370,117

PRINTING PLATE HOLDER Filed Nov. 20, 1943 LEE HUGUS TIA/E,

INVENTOR Patented Feb. 27, 1945 PRINTING PLATE HOLDER Lee Augustine, Cincinnati, Ohio, .assignor to The Printing Machinery Co., Cincinnati, Ohio, a

corporation of Ohio Application November 20, 1943, Serial No. 511,046

8 Claims.

#661,780, wherein a shoulder extending diagonal- 1y across a face of the jaw is of such size as to fit within the groove of the foundation base and in which the shoulder .is extended as a tip to interlock underneath an adjacent corner edge of a printing plate.

Broadly it is an object of my invention to provide a clamping jaw for such aplate holder which in one position may be used as a right, and abut one edge of a printing plate, but which upon being inverted in position may be used as a left to abut against an edge of a printing plate extending at right angles to the edge clamped when the jaw is used as a right.

The above objects and other objects to which reference will be made in the ensuing disclosure, I accomplish by that certain combination and arrangement of parts of which I have illustrated a preferred embodiment.

In the drawing:

Figure l is a perspective view of the clamping jaw of a printing plate holder enlarged in size for purposes of' more clearly showing the construction.

Figure .2 is an end elevation of the jaw in the position illustrated in Figure 1.

Figure 3 shows the jaw illustrated in Figure 1 in inverted position,

Figure 4 is an end elevation of the jaw shown 7 in Figure 3, it being observed that the end elevation of both Figures 2 and 4 are substantially similar.

Figure 5 shows a portion of a grooved foundation base with several of the new type jaws in use, one used as a right and the other used as a left.

Figure 6 is a sectional view along the lines 6-6 in Figure 5, it being here observed that the sectional view from the position 6a in Figure 5 is substantially identical with that shown in Fig ure 6.

Figure '7 is a fragmentary view in side elevation looking down a slot to show the wedging action of the block within the tapered slot.

has diagonally extending grooves .2, which are beveled from the base up to the surface of the foundation plate.

At 3 I have shown a fragmentary corner of a printing plate and showing one jaw used as a right against one edge of the printing plate and another jaw used as a left against an adjacent edge of the printing plate, which extends at angles to the first noted edge. a

The jaws are held in position by means of blocks 4 which fit within the grooves and have threaded openings .5 therein, which receive the threads of clamping screws '6, which extend through openings medially arranged in the clamping jaw.

In view of the fact that my novel clamping jaw is adapted for use either as a right or asa left, it should be noted that the opening l'through the clamping jaw is counter-bored both from the upper and lower surface, so that the head of the attaching screw may be drawn down .into position flush below the l-evel of the printing plate.

The jaw in vertical lateral section is of'rhomboid shape with beveled side edge clamping faces 8 and 8a. Since the clamping faces 8 and-Baconstitute parallel sides of a rhomboid, one corner of each. clamping face is an acute angle, whereas the other corner is an obtuse angle, thus .in Figures 1 to 4 the obtuse angle of the clamping face 8 is the corner 9, and the obtuse angle of the clamping face 8a is the obtuse angle 9a.

The foundation base I, as shown in Figure 5, 6o

Extending diagonally and in parallel alignment across the upper and lower surface of the jaw are shoulders l0, Illa.

Adjacent the obtuse angle corner edges of its clamping'face the shoulder H! is extended to form an underplate interlocking tip H, and on the opposite side of the jaw the shoulder Inc is extended adjacent the obtuse angle of the clamping face as indicated at I la.

By observing Figure 5, it will be seen that when the jaw is in upright position as shown in Figure 1, it may be secured against a horizontal edge of a printing plate and the clamping face 8 will abut the edge of the plate and the tip ,lla will interlock underneath the printing plate, and prevent undue strain on the screw, and also prevent the jaw from riding up the edge of the plate.

When the jaw is inverted in the position shown in Figure 3, it may be used as a left and abut a vertical edge of the printing plate, in which position the extending tip of the diagonally extending shoulder will interlock underneath the printing plate.

Thus without providing individual left and right clamping jaws, I am able by my novel construction as herein set forth, to provide a jaw which may be used either as a right or a left, in which whether it is used as a right or a left, it will always have a diagonally extending shoulder which guides the clamp within the groove, and it will always have a projecting tip of a shoulder which interlocks against the lower corner edge of the printing plate.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A jaw for a printing plate holder the lateral vertical section of which is of rhomboid shape with beveled side edges, and which has a hole extending medially therethrough with counterbores on both ends of the hole for receiving the head of an attaching screw when said jaw is either in upright or inverted position, both upper and lower surfaces of said jaw being provided with grooves engaging shoulders extending diagonally thereacross in parallel alignment, said shoulders extending out beyond the obtuse angled corner edges of the jaw to interlock underneath a printing plate and being flush at the acute angled edges.

2. A reversible jaw adapted for use as a right or left in combination in a printing plate holder and having on both upper and lower surfaces groove engaging shoulders and parallel beveled clamping faces along both edges of the jaw with the shoulders extending to form underplate engaging tips adjacent the obtuse angles of the clamping faces.

3. A printing plate holding device for a grooved base, comprising in combination with a threaded block to fit within the groove and a screw adapted to extend through the jaw and by engaging the threaded portion in the block, to lock the jaw against an edge of a printing plate, a jaw having beveled clamping side edges extending in parallel alignment forming a rhomboid shape in lateral cross section and shoulders extending in parallel alignment diagonally across both upper and lower faces of said jaw of a size fitting within the groove to guide the adjustment of thejaw.

4. A printing late holding device for a grooved base, comprising in combination with a threaded block to fit within the groove and a screw adapted to extend through the jaw and by engaging the threaded portion in the block, to lock the jaw against an edge of a printing plate, a jaw having beveled clamping side edges extending in parallel alignment forming a rhomboid shape in lateral cross section and shoulders extending in parallel alignment diagonally across both upper'and lower faces of said jaw of a size fitting within the groove to guide the adjustment of the jaw, and projections of said shoulders extending beyond the plane of bevel of said clamping edges in position to interlock under a printing plate.

5. A printing plate holding device for a grooved base, comprising in combination with a threaded block to fit within the groove and a screw adapted to extend through the jaw and by engaging the threaded portion in the block, to lock the Jaw against an edge of a printing plate, a jaw having beveled clamping side edges extending in parallel alignment forming a rhomboid shape in lateral cross section and shoulders extending in parallel alignment diagonally across both upper and lower faces of said jaw of a ize fitting within the groove to guide the adjustment of the jaw, and projections of said shoulders extending beyond the plane of bevel of said clamping edges in position "to interlock under a printing plate, said jaw being adapted for use as a right against one edge of a printing plate, and when inverted as a left against an edge of the printing plate extending at right angles to that which against which the jaw is used as a right.

6. An invertible clamping jaw for a printing plate holder for a grooved foundation base provided with clamping faces along the side edges and means for guiding said jaw in a groove as a right when in upright position and as a left when in inverted position, said jaw having a hole extending medially therethrough with counter-bores extending down from both the upper and lower surface of the jaw.

7. An invertible clamping jaw for a printing plate holder for a grooved foundation base provided with clamping faces along the side edges,

7 and means for guiding said jaw in a groove as a right when in upright position and as a left when in inverted position, said means comprising diagonally extending shoulders having width to fit within the grooves, and tips projecting from the obtuse angled corner edges of the clamping faces of said jaw.

8. An invertible clamping jaw for a printing plate holder for a grooved foundation base provided with clamping faces along the side edges and means for guiding said jaw in a groove as a right when in upright position and as a left when in inverted position, said means comprising diagonally extending shoulders having width to fit within the grooves, and tips projecting from the obtuse angled corner edges of the clamping faces of said jaw, one tip at one corner adapted to interlock under a printing plate when the jaw is in one position and another tip at a diagonally opposite edge adapted to interlock under a printing plate when the jaw is used in inverted position.

LEE AUGUSTINE. 

